Author: Robert Hyatt
Date: 14:50:30 10/13/99
Go up one level in this thread
On October 13, 1999 at 17:23:14, Howard Exner wrote:
>Here's an example of pawn majority knowledge. A program
>with pawn majority knowledge of the queen side configuration in this
>example may well find the winning move Qg6+.
>
>4Q3/6pk/2pq4/3p4/1p1P3p/1P1K1P2/1PP3P1/8 b - - bm Qg6;
>
>After the exchange of queens will follow the the advance of the black king to
>the kingside, then exchanges of the kingside pawns, and finally the king can
>march over to pick up the queenside pawns. Is knowledge that white cannot break
>through on the queenside essential for solving this? Would any program find Qg6?
not a good example it seems. black can win tactically also... Crafty
finds Qg6 instantly, even on my notebook... And says that black is +2
from winning material after a lot of checks. the majority code I have is
fairly good at saying 'black has good winning chances here' but it can't
override winning 3 pawns or so, which Qg6+ does.
8 0.91 ++ 1. ... Qg6+!!
8 1.47 1.86 1. ... Qg6+ 2. Ke3 Qg5+ 3. Kf2 Qd2+
4. Kf1 Qxc2 5. Kg1 Qxb2 6. Kh2 Qxb3
7. Qxc6
8-> 1.70 1.86 1. ... Qg6+ 2. Ke3 Qg5+ 3. Kf2 Qd2+
4. Kf1 Qxc2 5. Kg1 Qxb2 6. Kh2 Qxb3
7. Qxc6
9 3.07 1.83 1. ... Qg6+ 2. Ke3 Qg5+ 3. Kf2 Qd2+
4. Kf1 Qd1+ 5. Kf2 Qxc2+ 6. Kg1 Qxb2
7. Kh2 Qxb3 8. Qd8 Kg6 9. Qxh4
9-> 3.22 1.83 1. ... Qg6+ 2. Ke3 Qg5+ 3. Kf2 Qd2+
4. Kf1 Qd1+ 5. Kf2 Qxc2+ 6. Kg1 Qxb2
7. Kh2 Qxb3 8. Qd8 Kg6 9. Qxh4
10 5.81 2.00 1. ... Qg6+ 2. Ke3 Qg5+ 3. Kf2 Qd2+
4. Kf1 Qd1+ 5. Kf2 Qxc2+ 6. Kg1 Qxb2
7. Kh2 Qxd4 8. Qxc6 Qf4+ 9. Kh1 d4
10-> 6.00 2.00 1. ... Qg6+ 2. Ke3 Qg5+ 3. Kf2 Qd2+
4. Kf1 Qd1+ 5. Kf2 Qxc2+ 6. Kg1 Qxb2
7. Kh2 Qxd4 8. Qxc6 Qf4+ 9. Kh1 d4
and the score continues to slowly rise...
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